Coating-machine



A. J. MORRISON COATING MACHINE.

APPLICATION FILED 05c. II. 1918.

Patented Feb. 17, 1920.

4 SHEETS-SHEET I.

[Q INVENTOR.

ALFRED J Mme/50M u i TORNEY AL F850 .1 MORE/50M I N V E N TOR A. J. MORRISON COATING MACHINE.

APPLICATION FILED DEC-l7. 191a.

Patented Feb. 17, 1920.

4 SHEETSSHEET 2.

A. J. MORRISON COATING MACHINE.

APPLICATION FILED DECAY, I918.

1,331,460. Patented Feb. 17, 1920.

4 SHEETS-SHEET 3- IEII 52 I:

5 & A. l I l I 3/ I I 25 3/ 47 $9 h 4 I l 38 6/ I I E I 3/ 7 i I i 52 48 i 25 I I 4/19 was INVENTOR. ALFRED J MORRISON A. J. MORRISON COATING MACHINE.

APPLICATION FILED DEC-17. 1918- 1 ,3 3 1 ,4:6(). Patented Feb. 17, 1920.

4 SHEETSSHEET 4.

I N VEN TOR. A1. FRED J Mam/s o/v.

A TTORNE Y.

- UNITED- STATES PATENT OFFICE.

ALFRED J'. MORRISON, OF DENVER, COLORADO, ASSIGNOR OF ONE-HALF TO WILLIAM E.

' WARNEKE, 01 DENVER," COLORADO.

COATING-MACHINE.

Specification of Letters Patent.

Patented Feb. 1'7, 1920.

To all whom it may concern:

Be it known that I, ALFRED J. Momuson,

a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in Coating-Machines, of which the following is a specification.

This invention relates to improvements in machines for coating sheets of paper or other material with a liquid or semi-liquid adhesive, chemical or water-proofing substance, and more particularly-to machines of the. type commonly -used in box factories and printing establishments to provide labels, pasters or box covers with a coating of liquid gum or other adhesive.

It is the primary object of my invention to provide in a machine of the character mentioned, certain features of construction which increase the capacity and efliciency of the machine and prevent the waste and loss of labor caused by curling of the sheets,

- imperfect coating and irregular delivery experienced in many of the machines at present in use.

, In the operation of my machine, evenly coated sheets are fed at regular intervals onto a belt-conveyor which carries them to a point of discharge in a perfectly flat condition, ready for immediate or later use as the case may be.

Another object of the invention is to pro-- vide means for feeding the sheets of paper onto the coating element of the machine, which are regulatable so as to adapt the machine for properly coating sheets of paper and other material irrespective of their weight and finish.

Still other objects of the invention reside in mounting the cooperative parts of the machine so as to facilitate cleaning and relative adjustments and in providing means which cause the coating process. to be immediately resumed after stoppage and thus prevent waste of material otherwise resulting from an interrupted supply of liquid .onto thecoating element of the mechanism.

tions, arrangements and combinations of cooperative devices illustrated in their preferred form in the accompanying drawings in the various views of which like parts are similarly designated, and in which- Flgure 1 represents a plan view of the machme;

Fig. 2, a side elevation of the same;

1g. 3, an'enlarged fragmentary section along the line 33, Fig. 2;

Fig. 4, a section taken on the line 4-4, Flg. 3;

Fig. 5, a vertical section on the line 55, Fig. 4;

Fig. 6, a fragmentary enlarged side elevation of one of the side plates at the head end of the machine, between which the coating mechanism is contained;

Fig. 7, an enlarged section through the feed-gate of the machine taken on the line 7-7, Fig. 5;

Fig. e, an enlarged section along the line 8-8, Fig. 6;

Fig. i), a sectional view of the water-bath and ad acent parts for moistening the conveyrng belt of the machine;

Fig. 10, an enlarged section on the line 10 10, Fig. 6;

Fig. 11, a section taken on the line 1111, Fig. 2, and

Flg. 12, a fragmentary side view of the gearing on the outside of the side plate at the head end of the machine, opposite to that shown in Fig. 6.

Referringmore specifically to the drawlngs, the reference character 2 designates the supporting structure of the machine upon which the parts of its operating mechstructure, comprises a pan 3 which in practice contains the liquid adhesive or other substance to be applied to the sheets of material and which in its operative position is removably supported upon the upper end of a slanting rest 4.

The pan has for its further support a pair of laterally projecting ears 5 which rest upon lugs extending outwardly from two upright side plates 6 erected upon the supporting structure, between whlch the coating and feeding elements ofvthe mecha nism are assembled.

When it is desired to refill the pan it may be lowered and replaced without danger of spilling its contents, by sliding it along the slantin surface of the support' which is adapted to hold it in its lower position as indicated in broken lines Fig. 4,-in connection with a rod 7 extending transversely bet'we'en the side plates 6. t

A metal roller 8 dips into the fluld conheld in their adjusted positions by clamping screws 15 extending through arcuate 'slots 16 in the same. The coating roller 9 is mountedgfor rotation about a fixed axis in bearings in the side lates and it will be seen that by proper a justment of the levers 14 the bushings can be moved in their respective bearings so as to vary the distance beother forei surface as it emer es from the bath in the.

%y prevents their being;

transferred to the surface of the coating pan 3, and there tween the two rollers in accordance with the thickness of the coating of liquid it is desired to apply to the sheets under treatment. I

A bar 17 extending lengthwise of the dipping roller in or near the horizontal plane of its axis of rotation and in parallel and spaced relation to its circumferential surface, provides means to separate all dirt and matter from the liquid on said roller.

--The bar 17 has wings 18 extending along the portions of the gudgeons of the roller between its opposite ends and their respective bearings, to automatically clean them from liquid andother adhering matter.-

The coating roller lies axially outside the vertical plane of the axis of the dipping roller so that rearward of their line of tan enoe a everthe machine is stopped after aperiod of o ration. It is the object of this pocket'to effect an immediate resum tion of the coating process when the n ce anism is again set in motion, by providing the surface of the coating roller w th li uid .in the interim during which the portion of the surface of the dip ping roller emerging from thebath, moves to the pointat which the rollers are in contact.

' It will be seen that by these means waste of material by imperfect coating of sheets,

due to intermittent operation of the ma-.

chine, is efiectiv'ely avoided.

the coating roller pocket 19 is formed'in which a, sma quantity of liquid is collected :when-- The of paperwhich are fed onto y the feed mechanism one t of which ishereinafter described,

are 11 ed from its surface to pass onto a vconveying belt 20, by a plurality of lifters 21 which are rigidly mounted upon' a transverse rod 21 between the side plates and freely rest upon the roller.

The forward edges of these lifters curve from the surface of the roller around the port on of the conveying belt as it passes around the rearward one of the rollers upon which it is mounted, so'that the sheets of paper which were fed onto the roller and would naturally adhere to the liquid-carrying surface thereof, are automatically separated from said surface and directed onto the forwardly moving portion of the belt.

In order to eliminate any obstructive edges which may prevent the uninterrupted passage of sheets of paper from the'surface of the coating roller onto the curved edges of the lifters, the latter rest in narrow circumferential grooves 22 of the roller and these grooves are kept clean and free from the liquid applied to the surface of the roller, by slender wire wipers 23 as shown inFig. 5, which extend into the same from a transverse bar 24 supported between the side plates.

As will be seen by referring to Figs. 3 and 4, a portion of each wiper 23 extends into andsubstantially fills its associated circumferential roove 22 in the zone of contact or tangency tween the rollers 8 and 9. Since such entering portions of the wipers subtantially fill the grooves, the glue is practically revented from enterin thereinto from e glue pocket 19 and t us a more uniform coating of theblanks or sheets is obtained.

k The lifters are rigidly held in place on the rod 21 and can not be displaced and injured as might occur in. case'they could be lifted from' the grooves of the roller, into which they extend. As shown in Fig. 3, the grooves are relatively narrow and the portions of the lifters enterin said grooves are of substantiall the full wldth thereof so as to practically ll the grooves. I

Any vapproved feed-mechanism may be employed. That shown consists of a travcling platform 25 upon which in practice a stack of the sheets of aper to be coated is supported, an adjusta le gate 26 which limits the forward movement of the sheets by operation of the platform, to one at a time, a pair of friction rollers 27 and 28 whichremove the sheets fromthe platform, a stationary table 29 along which theypass toward the coating-roller, and a guideroller 30 whichmoves-thesheets onto the liquid-carrying surface of the same.

The moving platform consists of a-plurality of rubber belts'31 placed adjoiningly the side plates 6. I w

One of the end rollers of the series carries a. pinion 33 for its operative connection with a power transmission mechanism hereinafter to be described and it is operatively connected with the roller at the opposite end of the same by a sprocket chain 34. \Vheels 32 beneath the other end roller of the series hold the belts against lateral displacement.

In vertical alinement with the axis of the roller at the end of the series rearmost with relation to the movement of the belts, is the gate 26 which is adjustably supported on two spaced bars 35 which are horizontally secured between the side plates.

The gate consists of a metal block 36 secured at the lower end of and in transverse relationvto a stem 37 which projects loosely throughalined openings in the bars 35, and a wing-nut 38 applied to the threaded upper end of the stem and resting upon the upper bar holds the block against downward movement by gravitation and the pressure of a spring 39 which is woundaround the por tion of the stem between the lower bar and the block 36.

The block is recessed along its lower edge to receive the body portion of a rubber shoe 4-0 which extends across said edge to engage the upper surface of a sheet passing beneath the same by movement of the rubber belts 31. Y

A plate 41 fastened upon the block provides a support for a movable plate 42, the lower edge of which is bent around the corresponding edge of the first-mentioned plate as at 43 and is rounded to proyide a gradual approach to the lower surface of the rubber shoe.

' It is the object of this approach to eliminate edges and surfaces which if engaged by the forward edge of the moving sheet of paper might tend to curl, bend or break the same and thereby interfere with the production of coated sheets in a flat and perfectcondition, which is the primary objectof the present invention.

The plate 42 has a vertical slot for the passage of a clamping screw 44 by which it is held on the bars 35 and by looseningthis screw it may be adjusted to regulate the position of its curved lower end with relation to the surface of the rubber shoe.

The lower one. 28, of the two friction rollers is provided with a pinion 45 for its connection with the transmission mechanism and the upper roller 27 has gudgeons extending loosely through vertical slots in the side plates and rests loosely upon the surface of the other roller.

The guide-roller 30 which likewise is provided with a pinion 103, is positioned at the rearward end of the stationary table 29 and in spaced relation to the surface of the coating-roller 9 and its object is to compel sheets moved toward the coating roller by the friction-rollers'27 and 28, to engage the liquid-coated circumferential surface of the same.

The gearing of the transmission mechathat the roller 28 moves at a velocity slightly exceeding that of the platform and the guide-roller 30 rotates at greater speed than the friction-roller 28, for the purpose of holding the sheets moving'onto the coating roller, in a tense condition and thereby preventing their buckling, bending or folding.

The dipping roller is rotated at a velocity slightly exceeding that of the coating roller for the purpose of obtainin a slight scrap ing effect which prevents the accumulation of dirt on their engaging surfaces.

The sheets to be coated are placed in a stack on the moving platform against the gate and they are held against sidewise displacement by a plate 46 which is adjustably supported on the bars 35 to which the gate is secured.

The movement of the rubber belts 31 of which the platform is composed, causes the belts are frictionally engaged by the next following sheet or sheets.

If the surface of the sheets is embossed or otherwise roughened the frictional contact of the sheets above the lowermost one, with the belts, may cause a second sheet to be crowded through the space beneath the gate before the lower sheet has cleared the same, with the result that the sheets are fed onto the coating roller in overlapping relation.

To prevent an occurrence of this character, an adjustable tilting element is provided which operates to raise the stack of sheets partially off the surface of the traveling platform. The extent of the contact of the sheets with the belts may, by adjustment of this tilting element, be varied according to the roughness of their surface and the frictional adherence between the belt and the sheets can thus be regulated so that the sheets will be separately and successively moved through the space beneath the gate.

The tilting element consists of a series of arallelslats 47 movably mounted ona rod 8 between the u per ends of two arms 49 which are pivotal y connected w1th the side plates and are held in their adjusted position by clamping nuts 50.-

The free ends of the slats rest upon one of the rollers 32 within the space between the endless belts and it will be on that by changing the angle of inclination of the arms49 the distance between the ends of the slats and that of the moving platform may be varied. to lift the paper off the belts to an desired extent.

The sheets which were moved .onto the table'29 by the action of the friction rollers, pass underneath the guide-rolle'r30 which causes them to engage the liquid-carryingsurface of thecoating roller which is continuously kept in a moist condition by contact-with the dipping roller.

, The adhesive hquid carried by the coating roller is thus transferred to a surface of the sheets which subsequently are compelled to separate from the surface of'the roller by engagement with the curved edges of the lifting fingers 21.

' The lifted sheets are by these means transferred onto the before-mentioned endless 56 are mounted-in an elevated two parallel rails 57 of a superframe of the 40,

belt conveyer which carries them to a re-.. a mote point of discharge.

The belt conveyer which is made of canvas or other suitable materiahpreferably absorbent, is mounted upon a series of rollers one of which, 51, extends above and in close proximit to the curved edges of the lifters 21 while t eothers, 52 53, 54, 55 and position upon su porting structure.

he lower portion of the belt passes over a roller 58 which dips into a water-pan 59 supported between two uprights 60 of the frame, for the purpose of moistening the outer surface of the belt..

A roller 61 which is mounted upon I air of levers 62 fulcrumed on the uprights 60,

- stretch of t serves to lift the belt off the moistening roller to discontinue the supply of moisture thereto.

- An idle roller '55 in conjunction with a The belt is wetted by the roller 58 for the.

purpose of preventing curling of the liquidcoated sheets, by the 'applicatlon of moisture to their lower uncoated surfaces, and to .further promote the delivery of the sheets in, perfectly flat condition. and. prevent their dis lacement on the, belt, a series of. endless c ains 65 are placed on pulleys 67 and rollers 68 and69 above the upper stretch of the belt, to engage the sheets of paper su orted thereon. I

' he chains which extend parallel in longitudinal relation to the upper stretch of the belt, movein the same direction and by engagin the coated'upper surface .of the sheets 6 paper as they move onto'the belt from the edges of the lifters, prevent their displacement while keeping them at the i same time in a flat condition.

In orderto remove any adhesive that may be transferred to the chains from the coated sheets with which they come in contact, a

roller: 70 of felt or other absorbent material,

saturated with water, is mounted between two standards 71 on the frame to engage the chains as they pass across the roller 68.

The forward roller 69 upon which the chains are sup orted is placed at a distance rearward of t e adjacent end roller 54 of the belt 20, to compel the chains to disengage the sheets and permit of; their removal fromthe belt before they reach the forward end thereof.

, The rollers 51 and 67 upon'whi'ch the belt and the chainsare supported 'at their-rearmost ends are mounted on two arnis 72 which are pivoted as at 73 at the .u per ends of the side plates 6 andwhich are eldj position by means of clamp in their normal ing nuts 74.

his arrangement affords a read for obtaining access to the dipping and coating rollersand the lifters supported upon. the latter, b displacing the su rposed parts of the elt and chains .whic is readily accomplished by turning the arms 72 about their pivots as shown in broken lines in Fig. 6 of the drawin s.

The different elements of the coating machine thus described are connected to operate in conjunction bya driving and powertransmission mechanism which in the conmeans struction shown in the drawings receives its motion from a conveniently disposed movement from the motor through the me- I d'ium of a belt 79.

The rotative'continuity between the driving shaft and the pulley with which the belt engages, is established through the intermediary of a clutch 80 the adjustable part-of i which is by means of a system of rods 81 and 82 and coiipera-ting levers 83, Stand 85 connected witha 'end of the machin pedal 86- 'at the forward When the machine is used in' coating covers for boxes or other articles of manufacture, the machine by which the covers are applied to the frames of the boxes is placed adjacent the forward end of the coating machine, and by placing the controlling levers of the latter at the same end,

The driving shaft 76 carries at one of its ends a gear-wheel 87 which meshes with a gear-wheel 88 on one of the trunnions of the dipping roller and it also carries a sprocket-wheel 89 which by a chain 90 is operatively connected with a corresponding wheel 91 of smaller diameter on a studshaft 92 secured to the adjacent 'side plate 6. A gear-wheel 93 on the stud-shaft meshes with the gear-wheel 45 on the lower friction roller and also with the pinion 33 .which as stated before, connects with the rear end-roller of the series upon which the belts 31 of the traveling platform are supported.

The pinion 33 is loosely mounted on a gudgeon of the roller and its rotative continuity therewith is' secured or broken by moving it along the gudgeon through the medium of a crank-shaft 94 and a rod 95 operatively connected with a hand-lever.96 at the forward end of the machine.

The mov ement of the forward end roller of the series is transmitted to that at the opposite end of the same by means of the before-mentioned chain 34 which for safety is inclosed by a casing 97.

The dipping roller transmits its rotary movement to the coating roller by the engagement of its gear-wheel 88 with a simi:

lar gear-wheel 98 mounted at an end there of, and the coatin roller carries furthermore a sprocket-w eel 99 for its driving connection with the endless belt.

This connection is established through the medium of the before-mentioned frictlon roller 56 which engages the lower portion of the belt immediately beneath the roller 52 upon which its upper stretch is supported, and which has a sprocket wheel 100 connected with the other sprocket-wheel'by a chain" 101.

The gear-wheel 98 on the coating-roller transmits its rotary motion to a gear-wheel 104 on the shaft upon which the pulleys 67 of the chains are mounted, through the medium of an intermediate gearwheel 105 on the lower roller 51 of the belt-conveyor 20, and it furthermore meshes with the pinion 103 of the guide-roller 30.

Inasmuch as the operation of the machlne has been explained at intervals in the course of the foregoing description it will only be necessary to outline it very briefly at this point. 1

The sheets bein placed in a stack upon the traveling platform in engagement with the plate 46 and the gate 26, are moved singly and successively through the'space 102 beneath the gate-by the movement of the rubber belts 31.

Thegate has been previously raised or lowered in accordance with the thickness of the material of which the sheets are composed, and the tilting element has been adjusted to prevent a second .or third sheet \from being crowded through the space he 'llieilth the gate by frictional contact with the e ts.

The sheets passing underneath the gate enter between the friction rollers 27 and 28 which carry them onto the table 29 beneath the guide roller '30 which compels them to move into engagement with the liquid-carrying surface of the coating roller.

This roller is constantly kept in a moist condition by engagement with the dipping roller which moves through the liquid contained in the pan 3 and the bar 17 removes dirt and other solid foreign matter from the surface of the dipping roller before it engages the coating roller and thereb prevents all impurities contained in the liquid from being transferred to the sheets.

After the sheets have been coated by contact with the moistened surface of the roller The chains 65 engaging the coated upper surfaces of the sheets, hold them in place upon the belt, and the moisture imparted to the belt by the rollers 58 cooperates with the chains to keep the sheets continuously in a.

perfectly flat condition.

The thickness of the coatin to be applied to the sheets is regulated by' adjustment of the dipping roller-through the medium of the levers 14, which varies the distance between its circumferential surface and that of the coating roller.

The operator may discontinue the o eration of the entire machine or that o the feeding mechanism only, by adjustment of the pedal 86 and the lever 96 at the for ward end of the machine and when it is desired to clean the parts of the machine which come in contact with the coating liquid after the work is finished, the pan 3 is removed by sliding it along the slanting surface of the support 4 and replaced by a. pan filled with clean water.

The arms 72 are moved about their pivots to remove the portions of the belt and .the chains above the operating mechanism and by setting the machinein motion every part may thus be cleaned without disturbing 1ts arrangement with relation to the other parts.

Havin thus described my improved coating mac ine in the best form at resent known to me I desire it understood t at variations in the construction and arrangement of its parts may be resorted to within the spirit of my invention as set forth in the following claims.

- IVhat I claim and desire to secure by Letters-Patent is: a

1. In a coating machine, a coatingeroller, means for feeding sheets thereto, a pan, a di ping roller cooperating with the coating ro ler and moving through the pan, and

supporting-means adapted to hold the pan in elther an 0 rative or an inoperative position and inc udlng a slanting surface for the sliding support of the pan during its movement from one position to another.

2. In a coating machine, a coating roller, a dippin roller tangent to the coating roller .to trans er a liquid carriedupon its circum- 'tatably supported, and means to rotate the bushings in the bearings whereby to regulate the distance between the rollers.

4. In a coatin machine, a coating roller having relative y narrow circumferential grooves, means for guiding sheets to the roller, lifters for causing the sheetsto separate from the roller, each lifter havin a narrow portion of substantially the wi th of, and extending into, an associated groove, another portion for guiding and directing sheets upwardly and reversely, and wipers i having circumferential each havin a rtion exten into and substantia y fil ing its'associa groove at the zone of entry therei'nto for the removal of entering matter.

5. In a coating-machine, a coating-roller coves, means for feeding sheets to the ro er, lifters causin the sheets to separate from the roller, an

and wipers extending'in the grooves for the removal of entering matter.

6. In a coatlng machine, a dipping roller,

-a coating roller in contact therewlth and having c rcumferential grooves on its surface, and wipers extending into said grooves in the zone of tangeney between the rollers.

7. In a coating machine, a dipping roller,

- endless belt tocarry extending freely. in the grooves thereof,.

eer-nee filling the grooves in the zone of tangency between said rollers and acting in advance of the lifters.

8, In a coating-machine, 'a coating-element, means for feedin sheets thereto, an

endless belt to carry t e sheets from the coating -element to a point remote-herefrom, a water-bath, a roller moving through the bath and in engagement with the outer surface of the belt, and means for separating the belt from the roller.

' 9. In a coating-machine, a ment, means for feedin sheets thereto, an endless belt to carry t e sheets from the coating element to a oint remote therefrom, and flexible trave ing means having a loose run portion resting by gravity upon the carryin portion of the belt to hold the coating elesheets in p ace thereon and having a relatively limited: portion in contact with sheets.

10. In a coating-machine, a coating element, means for feedin sheets thereto, .an endless belt to carry t e sheets from the coating element to a point remote therefrom, and endless flexible meanshaving a loose Trun portion restin b ravity'upon the carrying portion of the ing with the same to hold the sheets in place, said loose run portion having a relati'velylimited portion in direct contact with the sheets.

11. In a coatin -machine, a coating-element, means for fbedin sheets thereto, an endless belt to carry the sheets from the coating-element to a point remote therethe t and travelfrom, and endless chains engaging the.

same, and a roller of absorbent material en aging the ca portion of the belt an traveling wit the gaging the chains to clean them of adherent matter. 7

.14. In a coatin machine, a coating-element, means for eedin sheets thereto, an endless belt to carry s eets from the elebelt,

' latter at a ment to a point remote therefrom, and a support for the belt, adap ment to displace the 1i0lt1QI1 of the same adjoining the coating-e ement.

15. In a coating-machine, a coating-element, means for feeding sheets thereto, an endless-belt to carry sheets from the element to a point remote therefrom, endless chains resting upon the carrying portion of the belt, and a support for the belt and the chains adapted for adjustment to displace the portions of the same adjoining the coat ing element.

16. In a coating-machine, a coating-ele ment, means for feeding sheets thereto, an endless belt to carry sheets from the element to a point remote therefrom, endless chains resting upon the carrying portion of the rollers for the support of the belt and the chains adjacent the coating-element, pivoted arms on which the rollers are su ported, and means for locking the arms in their normal position.

17. In a coating-machine, a coating roller, and feeding-mechanism including a traveling platform, feed-rollers for moving sheets from the platform toward the coating roller, a guide roller for moving the sheets onto the same, and transmission mechanism which rotates the guide-roller at a greater speed than the feed-rollers and rotates the velocity exceeding that of the traveling platform. 18. In a coating machine, a coatingroller, and feeding-mechanism including feed rollers for moving sheets toward the coating-roller, and a guide roller for moving the sheets onto the same and transmission-mechanism which rotates the guide roller at a velocity exceedingthat of the feed-rollers.

19. In a coating machine, a coatingroller, and feeding-mechanism including a traveling platform, feed-rollers for moving sheets from the platform onto the coating-roller, and transmission-mechanism which rotates the feed-rollers at a velocity exceeding that of the platform.

20. In a coating machine, a coating roller having circumferential grooves,

ted for adj uststantially horizontal portion,

lifters each having a portion located in a groove, another lportion adapted to turn and direct the s eets in a reverse direction, a conveyor belt having an upwardly inclined portion extending from a point above the coating roller and adjacent the lifters, another substantially horizontal portion, and an endless chain trained to have a portion thereof contact and travel with the said inclined and horizontal portions of the belt.

21. In a coating machine, a coating element, a belt for conveying the sheets from the coating element to a delivery station, and endless retaining means resting by gravity uponand traveling with said belt to a point short of the delivery station for the purpose of lifting the conveying belt free of the retaining means at the de ivery station for the convenience in removing the sheets.

22. In acoating-machine, a coating element, a belt for conveying the sheets away from the coating element and having a suband an endless retaining band having a loose run lower flight with a relatively limited portion resting on said horizontal portion of the belt and an upper flight carried by a plurality of rollers having surfaces equally spaced from the adjacent portion of the belt by a distance substantially greater than the thickness of the retaining band so that the lower flight rests on the horizontal portion of the belt by gravity only and free from pressure by the rollers.

23. In a coating machine, a dipping roller and a coating roller contacting therewith and having its axis laterally spaced from the vertical plane through the axis of the dipping roller to form a glue pocket be tween said rollers, said coating roller having circumferential grooves, wipers extend ing into said grooves in the zone of tangency of the rollers and substantially filling the- 96 signature.

ALFRED J. MORRISON. 

